Barber License Exam (NIC) key terms

The process of killing most harmful microorganisms on nonliving surfaces and tools using an EPA-registered hospital-grade product. It is required for implements after each client and does not reliably kill bacterial spores.

The lowest level of infection control: mechanically cleaning a surface or tool to remove visible debris, oils, and some germs. It always precedes disinfection or sterilization and uses soap, water, and friction.

The complete destruction of all microbial life, including bacterial spores, usually achieved with an autoclave using steam under pressure. It is required for tools that may contact broken skin or blood.

A pressure vessel that sterilizes metal implements with high-pressure steam, typically at 250 degrees Fahrenheit for a set time. Items must be cleaned first, and packages are dated and monitored for effectiveness.

Disease-causing microorganisms such as hepatitis B, hepatitis C, and HIV that spread through contact with infected blood or body fluids. Barbers must follow standard precautions, including gloves and proper sharps disposal.

Infection-control rules treating all blood and body fluids as potentially infectious regardless of a client's known health status. They include handwashing, gloves, eye protection, and safe handling of contaminated linens and waste.

An older infection-control approach requiring workers to assume every client's blood and body fluids carry infection. Modern practice expands this into standard precautions, which add hand hygiene, PPE, and safe injection and waste handling.

Barriers worn to prevent contact with infectious material, such as gloves, aprons, and eye protection. Gloves are single-use, changed between clients, and never washed or reused because washing damages the barrier.

A Safety Data Sheet summarizes a chemical product's hazards, first-aid measures, storage, and handling instructions. Employers must keep these sheets accessible, and barbers should consult them before using unfamiliar disinfectants or color products.

The federal agency that sets workplace safety rules, including the hazard communication standard and bloodborne pathogens standard that apply in barbershops. Inspectors may review training records, SDS files, and safety practices.

The repeating cycle of hair growth: anagen (active growth), catagen (transition), and telogen (resting and shedding). Understanding it explains why some shedding is normal and why certain treatments take time to show results.

The active growth stage of the hair cycle, lasting years, during which cells in the follicle divide and build the hair shaft. Most scalp hairs are in this phase at any time.

The resting stage of the hair cycle, ending with shedding of the old hair as a new one begins growing beneath it. Daily shedding of many hairs is normal, and illness or stress can shift hairs into this phase.

An oily substance secreted by sebaceous glands attached to hair follicles that lubricates skin and hair. Excess sebum contributes to oily scalp and can weigh hair down, while too little causes dryness and flaking.

Glands in the skin, most numerous on the scalp and face, that produce sebum and empty into hair follicles. Their activity influences scalp oiliness and is affected by hormones and age.

A contagious fungal infection of the skin or scalp, commonly called ringworm, causing itching, scaling, and patches of hair loss. Barbers must not service affected areas and should refer the client to a physician.

Infestation with lice, which attach to hair and scalp and cause itching. It is contagious through shared combs, hats, and close contact, so barbers must stop service, disinfect implements, and refer the client for treatment.

A condition or circumstance that makes a service unsafe or inadvisable, such as broken skin, active infection, or a recent chemical burn. Recognizing contraindications protects both the client and the barber's license.

A mixture of shaving soap or cream and water whipped to a rich consistency that softens the beard and cushions the razor. Proper lather reduces friction and helps prevent razor burn and nicks.

Irritation and redness after shaving caused by too much pressure, a dull blade, or shaving against the grain. Prevention includes softening the beard, using light strokes, and rinsing with cool water afterward.

A shaving-related condition in which cut hairs curve back into the skin, causing bumps and inflammation, most often in clients with tightly curled hair. Barbers may need to avoid close shaving and recommend trimming instead.

Cutting hair with clippers held without a guard, using the blade's taper to create blends and outlines. The barber controls length with wrist angle and pressure, so steady hand position is essential.

A cutting method in which clippers run over a comb held in the hair to remove length while leaving a controlled layer. It is used for blending and for shortening bulk before detailing.

A gradual change in hair length, usually from shorter at the neckline and sides to longer above, creating a blended transition. Tapers are built with clipper guards, blade angles, and comb techniques.

The angle at which hair is held away from the head before cutting, which determines the resulting shape and layering. Low elevation builds weight, while high elevation removes weight and creates layers.

Dividing hair into controlled, clipped-off areas so each cut is precise and balanced. Consistent sections let the barber compare sides, check elevation, and avoid overcutting one area.

A small application of a chemical product on the skin, usually behind the ear or in the elbow crease, checked after 24 to 48 hours for an allergic reaction. It is required before certain color or lightener services.

A test on a small cutting of the client's hair to predict how a color, lightener, or relaxer will perform and how long it will take. Results guide processing time and help prevent damage.

A hydrogen peroxide solution that, when mixed with color or lightener, opens the cuticle and drives the chemical reaction. Its volume determines lifting strength, from low-volume deposit-only formulas to high-volume lighteners.

The inner layer of skin containing blood vessels, nerves, glands, and hair follicles. Because follicles sit here, services that affect the follicle, such as waxing or relaxing, act below the surface layer.

The thin, outer protective layer of skin that sheds and renews itself continuously. It contains no blood vessels, so shallow cuts here bleed little, but it must be kept intact to block infection.

The skull bones that shape the face, including the mandible, maxilla, zygomatic, and nasal bones. Knowing their landmarks helps a barber plan beard lines and haircuts that suit the client's structure.

The chewing muscles, including the masseter and temporalis, that move the jaw. They affect facial shape and can be felt during shaving, so the barber should ask clients to relax the jaw.

The services a licensed barber is legally permitted to perform under state law, such as cutting, shaving, and certain chemical services. Performing services outside that scope can lead to fines or license discipline.

The legal authorization to practice barbering, granted by a state board after meeting education, examination, and application requirements. Licenses must be renewed and displayed as state rules require.

Required coursework or training hours a licensee completes to renew a barber license, covering topics like infection control, safety, and new techniques. Requirements vary by state in hours and subject matter.